bn:05485892n
Noun Concept
Categories: Underground mining, Mining engineering
EN
shaft sinking  mine cage  mine shaft  mine shafts  shaft
EN
Shaft mining or shaft sinking is the action of excavating a mine shaft from the top down, where there is initially no access to the bottom. Wikipedia
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EN
Shaft mining or shaft sinking is the action of excavating a mine shaft from the top down, where there is initially no access to the bottom. Wikipedia
excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom Wikidata